What is 1.125 as a fraction
The Correct Answer and Explanation is:
To systematically name the given coordination compounds, we need to follow a specific set of naming conventions for coordination compounds that is established by the International Union of Pure and Applied Chemistry (IUPAC). Here’s the breakdown for each compound:
(a) K[Pt(NH₃)Cl₅]
- K stands for potassium, a cation.
- The complex ion is [Pt(NH₃)Cl₅].
- Platinum (Pt) is the central metal.
- The ligands around platinum are 5 chloride ions (Cl) and 1 ammonia molecule (NH₃).
Step 1: Start with the ligands. Ammonia (NH₃) is neutral, and chloride (Cl) is a negatively charged ligand.
- The prefix for 5 chloride ligands is “pentachloro.”
- “Ammonia” is used as is for NH₃, because it is a neutral ligand.
Step 2: Name the central metal. Since platinum is in the +2 oxidation state in this complex (based on the overall charge balance), we use “platinum(II).”
Step 3: Name the complex ion. The overall complex cation is [Pt(NH₃)Cl₅]²⁺.
Systematic Name: Potassium pentachloridoammineplatinum(II).
(b) [Cu(en)(NH₃)₂][Co(en)Cl₄]
This compound consists of two coordination complexes:
- [Cu(en)(NH₃)₂]: This is a copper(II) complex with two ammonia molecules and one ethylenediamine (en) ligand.
- [Co(en)Cl₄]: This is a cobalt(III) complex with four chloride ions and one ethylenediamine ligand.
Step 1: Name the ligands.
- “en” is ethylenediamine, which is a bidentate ligand.
- Ammonia (NH₃) is a neutral ligand.
- Chloride (Cl) is a monoanionic ligand.
Step 2: Name the central metals.
- Copper is in the +2 oxidation state in the first complex, so it is named as “copper(II).”
- Cobalt is in the +3 oxidation state in the second complex, so it is named as “cobalt(III).”
Step 3: Name the complexes.
- For the copper complex: The ethylenediamine is the first ligand in the alphabetically ordered name, followed by ammonia. The copper oxidation state is in parentheses.
- For the cobalt complex: Ethylenediamine comes first, followed by chloride. The cobalt oxidation state is also in parentheses.
Systematic Name: Diammineethylenediaminecopper(II) tetrachloroethylenediaminecobalt(III).
(c) Pt(en)₂Br₂₂
- [Pt(en)₂Br₂] is a platinum(II) complex with two ethylenediamine ligands and two bromide ions.
- (ClO₄)₂ indicates two perchlorate counterions.
Step 1: Name the ligands.
- Ethylenediamine (en) is a bidentate ligand.
- Bromide (Br) is a monoanionic ligand.
Step 2: Name the central metal.
- Platinum (Pt) is in the +2 oxidation state, so it is “platinum(II).”
Step 3: Name the complex.
- The ethylenediamine ligands are named first, followed by bromide.
- The platinum oxidation state is placed in parentheses.
Systematic Name: Bis(ethylenediamine)dibromidoplatinum(II) perchlorate.
Summary of Systematic Names:
- K[Pt(NH₃)Cl₅]: Potassium pentachloridoammineplatinum(II)
- [Cu(en)(NH₃)₂][Co(en)Cl₄]: Diammineethylenediaminecopper(II) tetrachloroethylenediaminecobalt(III)
- Pt(en)₂Br₂₂: Bis(ethylenediamine)dibromidoplatinum(II) perchlorate
These names are derived from the IUPAC rules for naming coordination compounds, which prioritize the order of ligands, oxidation states of metals, and appropriate prefixes for the number of ligands.